package com.seo.controller.index;

import java.awt.image.BufferedImage;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import com.seo.utils.code.CaptchaUtils;


/**
 * 验证码
 * @author shibeilei
 *
 */
@Controller
public class CodeController {

    @RequestMapping("/code/captcha-image")
    public void getKaptchaImage(HttpServletRequest request, HttpServletResponse response,
                                HttpSession session) throws Exception {
        BufferedImage image = CaptchaUtils.generate();
        String code = CaptchaUtils.drawGraphic(image);
        code = code.toUpperCase();// 转成大写重要
        session.setAttribute(CaptchaUtils.CODE_SESSION, code);
        response.setHeader("Pragma", "no-cache");
        response.setHeader("Cache-Control", "no-cache");
        response.setDateHeader("Expires", 0);
        response.setContentType("image/jpeg");
        ServletOutputStream out = response.getOutputStream();
        ImageIO.write(image, "JPEG", out);
        try {
            out.flush();
        } finally {
            out.close();
        }
    }
}
